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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / video / backlight / adp8860_bl.c
blob19968104fc4791bb6adac8d7765aec7503066361
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Backlight driver for Analog Devices ADP8860 Backlight Devices
4 *
5 * Copyright 2009-2010 Analog Devices Inc.
6 */
7
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/errno.h>
11 #include <linux/pm.h>
12 #include <linux/platform_device.h>
13 #include <linux/i2c.h>
14 #include <linux/fb.h>
15 #include <linux/backlight.h>
16 #include <linux/leds.h>
17 #include <linux/slab.h>
18 #include <linux/workqueue.h>
19
20 #include <linux/platform_data/adp8860.h>
21 #define ADP8860_EXT_FEATURES
22 #define ADP8860_USE_LEDS
23
24 #define ADP8860_MFDVID 0x00 /* Manufacturer and device ID */
25 #define ADP8860_MDCR 0x01 /* Device mode and status */
26 #define ADP8860_MDCR2 0x02 /* Device mode and Status Register 2 */
27 #define ADP8860_INTR_EN 0x03 /* Interrupts enable */
28 #define ADP8860_CFGR 0x04 /* Configuration register */
29 #define ADP8860_BLSEN 0x05 /* Sink enable backlight or independent */
30 #define ADP8860_BLOFF 0x06 /* Backlight off timeout */
31 #define ADP8860_BLDIM 0x07 /* Backlight dim timeout */
32 #define ADP8860_BLFR 0x08 /* Backlight fade in and out rates */
33 #define ADP8860_BLMX1 0x09 /* Backlight (Brightness Level 1-daylight) maximum current */
34 #define ADP8860_BLDM1 0x0A /* Backlight (Brightness Level 1-daylight) dim current */
35 #define ADP8860_BLMX2 0x0B /* Backlight (Brightness Level 2-office) maximum current */
36 #define ADP8860_BLDM2 0x0C /* Backlight (Brightness Level 2-office) dim current */
37 #define ADP8860_BLMX3 0x0D /* Backlight (Brightness Level 3-dark) maximum current */
38 #define ADP8860_BLDM3 0x0E /* Backlight (Brightness Level 3-dark) dim current */
39 #define ADP8860_ISCFR 0x0F /* Independent sink current fade control register */
40 #define ADP8860_ISCC 0x10 /* Independent sink current control register */
41 #define ADP8860_ISCT1 0x11 /* Independent Sink Current Timer Register LED[7:5] */
42 #define ADP8860_ISCT2 0x12 /* Independent Sink Current Timer Register LED[4:1] */
43 #define ADP8860_ISCF 0x13 /* Independent sink current fade register */
44 #define ADP8860_ISC7 0x14 /* Independent Sink Current LED7 */
45 #define ADP8860_ISC6 0x15 /* Independent Sink Current LED6 */
46 #define ADP8860_ISC5 0x16 /* Independent Sink Current LED5 */
47 #define ADP8860_ISC4 0x17 /* Independent Sink Current LED4 */
48 #define ADP8860_ISC3 0x18 /* Independent Sink Current LED3 */
49 #define ADP8860_ISC2 0x19 /* Independent Sink Current LED2 */
50 #define ADP8860_ISC1 0x1A /* Independent Sink Current LED1 */
51 #define ADP8860_CCFG 0x1B /* Comparator configuration */
52 #define ADP8860_CCFG2 0x1C /* Second comparator configuration */
53 #define ADP8860_L2_TRP 0x1D /* L2 comparator reference */
54 #define ADP8860_L2_HYS 0x1E /* L2 hysteresis */
55 #define ADP8860_L3_TRP 0x1F /* L3 comparator reference */
56 #define ADP8860_L3_HYS 0x20 /* L3 hysteresis */
57 #define ADP8860_PH1LEVL 0x21 /* First phototransistor ambient light level-low byte register */
58 #define ADP8860_PH1LEVH 0x22 /* First phototransistor ambient light level-high byte register */
59 #define ADP8860_PH2LEVL 0x23 /* Second phototransistor ambient light level-low byte register */
60 #define ADP8860_PH2LEVH 0x24 /* Second phototransistor ambient light level-high byte register */
61
62 #define ADP8860_MANUFID 0x0 /* Analog Devices ADP8860 Manufacturer ID */
63 #define ADP8861_MANUFID 0x4 /* Analog Devices ADP8861 Manufacturer ID */
64 #define ADP8863_MANUFID 0x2 /* Analog Devices ADP8863 Manufacturer ID */
65
66 #define ADP8860_DEVID(x) ((x) & 0xF)
67 #define ADP8860_MANID(x) ((x) >> 4)
68
69 /* MDCR Device mode and status */
70 #define INT_CFG (1 << 6)
71 #define NSTBY (1 << 5)
72 #define DIM_EN (1 << 4)
73 #define GDWN_DIS (1 << 3)
74 #define SIS_EN (1 << 2)
75 #define CMP_AUTOEN (1 << 1)
76 #define BLEN (1 << 0)
77
78 /* ADP8860_CCFG Main ALS comparator level enable */
79 #define L3_EN (1 << 1)
80 #define L2_EN (1 << 0)
81
82 #define CFGR_BLV_SHIFT 3
83 #define CFGR_BLV_MASK 0x3
84 #define ADP8860_FLAG_LED_MASK 0xFF
85
86 #define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))
87 #define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))
88 #define ALS_CCFG_VAL(filt) ((0x7 & filt) << 5)
89
90 enum {
91 adp8860,
92 adp8861,
93 adp8863
94 };
95
96 struct adp8860_led {
97 struct led_classdev cdev;
98 struct work_struct work;
99 struct i2c_client *client;
100 enum led_brightness new_brightness;
101 int id;
102 int flags;
103 };
104
105 struct adp8860_bl {
106 struct i2c_client *client;
107 struct backlight_device *bl;
108 struct adp8860_led *led;
109 struct adp8860_backlight_platform_data *pdata;
110 struct mutex lock;
111 unsigned long cached_daylight_max;
112 int id;
113 int revid;
114 int current_brightness;
115 unsigned en_ambl_sens:1;
116 unsigned gdwn_dis:1;
117 };
118
119 static int adp8860_read(struct i2c_client *client, int reg, uint8_t *val)
120 {
121 int ret;
122
123 ret = i2c_smbus_read_byte_data(client, reg);
124 if (ret < 0) {
125 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
126 return ret;
127 }
128
129 *val = (uint8_t)ret;
130 return 0;
131 }
132
133 static int adp8860_write(struct i2c_client *client, u8 reg, u8 val)
134 {
135 return i2c_smbus_write_byte_data(client, reg, val);
136 }
137
138 static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
139 {
140 struct adp8860_bl *data = i2c_get_clientdata(client);
141 uint8_t reg_val;
142 int ret;
143
144 mutex_lock(&data->lock);
145
146 ret = adp8860_read(client, reg, &reg_val);
147
148 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
149 reg_val |= bit_mask;
150 ret = adp8860_write(client, reg, reg_val);
151 }
152
153 mutex_unlock(&data->lock);
154 return ret;
155 }
156
157 static int adp8860_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)
158 {
159 struct adp8860_bl *data = i2c_get_clientdata(client);
160 uint8_t reg_val;
161 int ret;
162
163 mutex_lock(&data->lock);
164
165 ret = adp8860_read(client, reg, &reg_val);
166
167 if (!ret && (reg_val & bit_mask)) {
168 reg_val &= ~bit_mask;
169 ret = adp8860_write(client, reg, reg_val);
170 }
171
172 mutex_unlock(&data->lock);
173 return ret;
174 }
175
176 /*
177 * Independent sink / LED
178 */
179 #if defined(ADP8860_USE_LEDS)
180 static void adp8860_led_work(struct work_struct *work)
181 {
182 struct adp8860_led *led = container_of(work, struct adp8860_led, work);
183
184 adp8860_write(led->client, ADP8860_ISC1 - led->id + 1,
185 led->new_brightness >> 1);
186 }
187
188 static void adp8860_led_set(struct led_classdev *led_cdev,
189 enum led_brightness value)
190 {
191 struct adp8860_led *led;
192
193 led = container_of(led_cdev, struct adp8860_led, cdev);
194 led->new_brightness = value;
195 schedule_work(&led->work);
196 }
197
198 static int adp8860_led_setup(struct adp8860_led *led)
199 {
200 struct i2c_client *client = led->client;
201 int ret = 0;
202
203 ret = adp8860_write(client, ADP8860_ISC1 - led->id + 1, 0);
204 ret |= adp8860_set_bits(client, ADP8860_ISCC, 1 << (led->id - 1));
205
206 if (led->id > 4)
207 ret |= adp8860_set_bits(client, ADP8860_ISCT1,
208 (led->flags & 0x3) << ((led->id - 5) * 2));
209 else
210 ret |= adp8860_set_bits(client, ADP8860_ISCT2,
211 (led->flags & 0x3) << ((led->id - 1) * 2));
212
213 return ret;
214 }
215
216 static int adp8860_led_probe(struct i2c_client *client)
217 {
218 struct adp8860_backlight_platform_data *pdata =
219 dev_get_platdata(&client->dev);
220 struct adp8860_bl *data = i2c_get_clientdata(client);
221 struct adp8860_led *led, *led_dat;
222 struct led_info *cur_led;
223 int ret, i;
224
225 led = devm_kcalloc(&client->dev, pdata->num_leds, sizeof(*led),
226 GFP_KERNEL);
227 if (led == NULL)
228 return -ENOMEM;
229
230 ret = adp8860_write(client, ADP8860_ISCFR, pdata->led_fade_law);
231 ret = adp8860_write(client, ADP8860_ISCT1,
232 (pdata->led_on_time & 0x3) << 6);
233 ret |= adp8860_write(client, ADP8860_ISCF,
234 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));
235
236 if (ret) {
237 dev_err(&client->dev, "failed to write\n");
238 return ret;
239 }
240
241 for (i = 0; i < pdata->num_leds; ++i) {
242 cur_led = &pdata->leds[i];
243 led_dat = &led[i];
244
245 led_dat->id = cur_led->flags & ADP8860_FLAG_LED_MASK;
246
247 if (led_dat->id > 7 || led_dat->id < 1) {
248 dev_err(&client->dev, "Invalid LED ID %d\n",
249 led_dat->id);
250 ret = -EINVAL;
251 goto err;
252 }
253
254 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {
255 dev_err(&client->dev, "LED %d used by Backlight\n",
256 led_dat->id);
257 ret = -EBUSY;
258 goto err;
259 }
260
261 led_dat->cdev.name = cur_led->name;
262 led_dat->cdev.default_trigger = cur_led->default_trigger;
263 led_dat->cdev.brightness_set = adp8860_led_set;
264 led_dat->cdev.brightness = LED_OFF;
265 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;
266 led_dat->client = client;
267 led_dat->new_brightness = LED_OFF;
268 INIT_WORK(&led_dat->work, adp8860_led_work);
269
270 ret = led_classdev_register(&client->dev, &led_dat->cdev);
271 if (ret) {
272 dev_err(&client->dev, "failed to register LED %d\n",
273 led_dat->id);
274 goto err;
275 }
276
277 ret = adp8860_led_setup(led_dat);
278 if (ret) {
279 dev_err(&client->dev, "failed to write\n");
280 i++;
281 goto err;
282 }
283 }
284
285 data->led = led;
286
287 return 0;
288
289 err:
290 for (i = i - 1; i >= 0; --i) {
291 led_classdev_unregister(&led[i].cdev);
292 cancel_work_sync(&led[i].work);
293 }
294
295 return ret;
296 }
297
298 static int adp8860_led_remove(struct i2c_client *client)
299 {
300 struct adp8860_backlight_platform_data *pdata =
301 dev_get_platdata(&client->dev);
302 struct adp8860_bl *data = i2c_get_clientdata(client);
303 int i;
304
305 for (i = 0; i < pdata->num_leds; i++) {
306 led_classdev_unregister(&data->led[i].cdev);
307 cancel_work_sync(&data->led[i].work);
308 }
309
310 return 0;
311 }
312 #else
313 static int adp8860_led_probe(struct i2c_client *client)
314 {
315 return 0;
316 }
317
318 static int adp8860_led_remove(struct i2c_client *client)
319 {
320 return 0;
321 }
322 #endif
323
324 static int adp8860_bl_set(struct backlight_device *bl, int brightness)
325 {
326 struct adp8860_bl *data = bl_get_data(bl);
327 struct i2c_client *client = data->client;
328 int ret = 0;
329
330 if (data->en_ambl_sens) {
331 if ((brightness > 0) && (brightness < ADP8860_MAX_BRIGHTNESS)) {
332 /* Disable Ambient Light auto adjust */
333 ret |= adp8860_clr_bits(client, ADP8860_MDCR,
334 CMP_AUTOEN);
335 ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
336 } else {
337 /*
338 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
339 * restore daylight l1 sysfs brightness
340 */
341 ret |= adp8860_write(client, ADP8860_BLMX1,
342 data->cached_daylight_max);
343 ret |= adp8860_set_bits(client, ADP8860_MDCR,
344 CMP_AUTOEN);
345 }
346 } else
347 ret |= adp8860_write(client, ADP8860_BLMX1, brightness);
348
349 if (data->current_brightness && brightness == 0)
350 ret |= adp8860_set_bits(client,
351 ADP8860_MDCR, DIM_EN);
352 else if (data->current_brightness == 0 && brightness)
353 ret |= adp8860_clr_bits(client,
354 ADP8860_MDCR, DIM_EN);
355
356 if (!ret)
357 data->current_brightness = brightness;
358
359 return ret;
360 }
361
362 static int adp8860_bl_update_status(struct backlight_device *bl)
363 {
364 int brightness = bl->props.brightness;
365
366 if (bl->props.power != FB_BLANK_UNBLANK)
367 brightness = 0;
368
369 if (bl->props.fb_blank != FB_BLANK_UNBLANK)
370 brightness = 0;
371
372 return adp8860_bl_set(bl, brightness);
373 }
374
375 static int adp8860_bl_get_brightness(struct backlight_device *bl)
376 {
377 struct adp8860_bl *data = bl_get_data(bl);
378
379 return data->current_brightness;
380 }
381
382 static const struct backlight_ops adp8860_bl_ops = {
383 .update_status = adp8860_bl_update_status,
384 .get_brightness = adp8860_bl_get_brightness,
385 };
386
387 static int adp8860_bl_setup(struct backlight_device *bl)
388 {
389 struct adp8860_bl *data = bl_get_data(bl);
390 struct i2c_client *client = data->client;
391 struct adp8860_backlight_platform_data *pdata = data->pdata;
392 int ret = 0;
393
394 ret |= adp8860_write(client, ADP8860_BLSEN, ~pdata->bl_led_assign);
395 ret |= adp8860_write(client, ADP8860_BLMX1, pdata->l1_daylight_max);
396 ret |= adp8860_write(client, ADP8860_BLDM1, pdata->l1_daylight_dim);
397
398 if (data->en_ambl_sens) {
399 data->cached_daylight_max = pdata->l1_daylight_max;
400 ret |= adp8860_write(client, ADP8860_BLMX2,
401 pdata->l2_office_max);
402 ret |= adp8860_write(client, ADP8860_BLDM2,
403 pdata->l2_office_dim);
404 ret |= adp8860_write(client, ADP8860_BLMX3,
405 pdata->l3_dark_max);
406 ret |= adp8860_write(client, ADP8860_BLDM3,
407 pdata->l3_dark_dim);
408
409 ret |= adp8860_write(client, ADP8860_L2_TRP, pdata->l2_trip);
410 ret |= adp8860_write(client, ADP8860_L2_HYS, pdata->l2_hyst);
411 ret |= adp8860_write(client, ADP8860_L3_TRP, pdata->l3_trip);
412 ret |= adp8860_write(client, ADP8860_L3_HYS, pdata->l3_hyst);
413 ret |= adp8860_write(client, ADP8860_CCFG, L2_EN | L3_EN |
414 ALS_CCFG_VAL(pdata->abml_filt));
415 }
416
417 ret |= adp8860_write(client, ADP8860_CFGR,
418 BL_CFGR_VAL(pdata->bl_fade_law, 0));
419
420 ret |= adp8860_write(client, ADP8860_BLFR, FADE_VAL(pdata->bl_fade_in,
421 pdata->bl_fade_out));
422
423 ret |= adp8860_set_bits(client, ADP8860_MDCR, BLEN | DIM_EN | NSTBY |
424 (data->gdwn_dis ? GDWN_DIS : 0));
425
426 return ret;
427 }
428
429 static ssize_t adp8860_show(struct device *dev, char *buf, int reg)
430 {
431 struct adp8860_bl *data = dev_get_drvdata(dev);
432 int error;
433 uint8_t reg_val;
434
435 mutex_lock(&data->lock);
436 error = adp8860_read(data->client, reg, &reg_val);
437 mutex_unlock(&data->lock);
438
439 if (error < 0)
440 return error;
441
442 return sprintf(buf, "%u\n", reg_val);
443 }
444
445 static ssize_t adp8860_store(struct device *dev, const char *buf,
446 size_t count, int reg)
447 {
448 struct adp8860_bl *data = dev_get_drvdata(dev);
449 unsigned long val;
450 int ret;
451
452 ret = kstrtoul(buf, 10, &val);
453 if (ret)
454 return ret;
455
456 mutex_lock(&data->lock);
457 adp8860_write(data->client, reg, val);
458 mutex_unlock(&data->lock);
459
460 return count;
461 }
462
463 static ssize_t adp8860_bl_l3_dark_max_show(struct device *dev,
464 struct device_attribute *attr, char *buf)
465 {
466 return adp8860_show(dev, buf, ADP8860_BLMX3);
467 }
468
469 static ssize_t adp8860_bl_l3_dark_max_store(struct device *dev,
470 struct device_attribute *attr, const char *buf, size_t count)
471 {
472 return adp8860_store(dev, buf, count, ADP8860_BLMX3);
473 }
474
475 static DEVICE_ATTR(l3_dark_max, 0664, adp8860_bl_l3_dark_max_show,
476 adp8860_bl_l3_dark_max_store);
477
478 static ssize_t adp8860_bl_l2_office_max_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480 {
481 return adp8860_show(dev, buf, ADP8860_BLMX2);
482 }
483
484 static ssize_t adp8860_bl_l2_office_max_store(struct device *dev,
485 struct device_attribute *attr, const char *buf, size_t count)
486 {
487 return adp8860_store(dev, buf, count, ADP8860_BLMX2);
488 }
489 static DEVICE_ATTR(l2_office_max, 0664, adp8860_bl_l2_office_max_show,
490 adp8860_bl_l2_office_max_store);
491
492 static ssize_t adp8860_bl_l1_daylight_max_show(struct device *dev,
493 struct device_attribute *attr, char *buf)
494 {
495 return adp8860_show(dev, buf, ADP8860_BLMX1);
496 }
497
498 static ssize_t adp8860_bl_l1_daylight_max_store(struct device *dev,
499 struct device_attribute *attr, const char *buf, size_t count)
500 {
501 struct adp8860_bl *data = dev_get_drvdata(dev);
502 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);
503
504 if (ret)
505 return ret;
506
507 return adp8860_store(dev, buf, count, ADP8860_BLMX1);
508 }
509 static DEVICE_ATTR(l1_daylight_max, 0664, adp8860_bl_l1_daylight_max_show,
510 adp8860_bl_l1_daylight_max_store);
511
512 static ssize_t adp8860_bl_l3_dark_dim_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
514 {
515 return adp8860_show(dev, buf, ADP8860_BLDM3);
516 }
517
518 static ssize_t adp8860_bl_l3_dark_dim_store(struct device *dev,
519 struct device_attribute *attr,
520 const char *buf, size_t count)
521 {
522 return adp8860_store(dev, buf, count, ADP8860_BLDM3);
523 }
524 static DEVICE_ATTR(l3_dark_dim, 0664, adp8860_bl_l3_dark_dim_show,
525 adp8860_bl_l3_dark_dim_store);
526
527 static ssize_t adp8860_bl_l2_office_dim_show(struct device *dev,
528 struct device_attribute *attr, char *buf)
529 {
530 return adp8860_show(dev, buf, ADP8860_BLDM2);
531 }
532
533 static ssize_t adp8860_bl_l2_office_dim_store(struct device *dev,
534 struct device_attribute *attr,
535 const char *buf, size_t count)
536 {
537 return adp8860_store(dev, buf, count, ADP8860_BLDM2);
538 }
539 static DEVICE_ATTR(l2_office_dim, 0664, adp8860_bl_l2_office_dim_show,
540 adp8860_bl_l2_office_dim_store);
541
542 static ssize_t adp8860_bl_l1_daylight_dim_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
544 {
545 return adp8860_show(dev, buf, ADP8860_BLDM1);
546 }
547
548 static ssize_t adp8860_bl_l1_daylight_dim_store(struct device *dev,
549 struct device_attribute *attr,
550 const char *buf, size_t count)
551 {
552 return adp8860_store(dev, buf, count, ADP8860_BLDM1);
553 }
554 static DEVICE_ATTR(l1_daylight_dim, 0664, adp8860_bl_l1_daylight_dim_show,
555 adp8860_bl_l1_daylight_dim_store);
556
557 #ifdef ADP8860_EXT_FEATURES
558 static ssize_t adp8860_bl_ambient_light_level_show(struct device *dev,
559 struct device_attribute *attr, char *buf)
560 {
561 struct adp8860_bl *data = dev_get_drvdata(dev);
562 int error;
563 uint8_t reg_val;
564 uint16_t ret_val;
565
566 mutex_lock(&data->lock);
567 error = adp8860_read(data->client, ADP8860_PH1LEVL, &reg_val);
568 if (!error) {
569 ret_val = reg_val;
570 error = adp8860_read(data->client, ADP8860_PH1LEVH, &reg_val);
571 }
572 mutex_unlock(&data->lock);
573
574 if (error)
575 return error;
576
577 /* Return 13-bit conversion value for the first light sensor */
578 ret_val += (reg_val & 0x1F) << 8;
579
580 return sprintf(buf, "%u\n", ret_val);
581 }
582 static DEVICE_ATTR(ambient_light_level, 0444,
583 adp8860_bl_ambient_light_level_show, NULL);
584
585 static ssize_t adp8860_bl_ambient_light_zone_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587 {
588 struct adp8860_bl *data = dev_get_drvdata(dev);
589 int error;
590 uint8_t reg_val;
591
592 mutex_lock(&data->lock);
593 error = adp8860_read(data->client, ADP8860_CFGR, &reg_val);
594 mutex_unlock(&data->lock);
595
596 if (error < 0)
597 return error;
598
599 return sprintf(buf, "%u\n",
600 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);
601 }
602
603 static ssize_t adp8860_bl_ambient_light_zone_store(struct device *dev,
604 struct device_attribute *attr,
605 const char *buf, size_t count)
606 {
607 struct adp8860_bl *data = dev_get_drvdata(dev);
608 unsigned long val;
609 uint8_t reg_val;
610 int ret;
611
612 ret = kstrtoul(buf, 10, &val);
613 if (ret)
614 return ret;
615
616 if (val == 0) {
617 /* Enable automatic ambient light sensing */
618 adp8860_set_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
619 } else if ((val > 0) && (val <= 3)) {
620 /* Disable automatic ambient light sensing */
621 adp8860_clr_bits(data->client, ADP8860_MDCR, CMP_AUTOEN);
622
623 /* Set user supplied ambient light zone */
624 mutex_lock(&data->lock);
625 ret = adp8860_read(data->client, ADP8860_CFGR, &reg_val);
626 if (!ret) {
627 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);
628 reg_val |= (val - 1) << CFGR_BLV_SHIFT;
629 adp8860_write(data->client, ADP8860_CFGR, reg_val);
630 }
631 mutex_unlock(&data->lock);
632 }
633
634 return count;
635 }
636 static DEVICE_ATTR(ambient_light_zone, 0664,
637 adp8860_bl_ambient_light_zone_show,
638 adp8860_bl_ambient_light_zone_store);
639 #endif
640
641 static struct attribute *adp8860_bl_attributes[] = {
642 &dev_attr_l3_dark_max.attr,
643 &dev_attr_l3_dark_dim.attr,
644 &dev_attr_l2_office_max.attr,
645 &dev_attr_l2_office_dim.attr,
646 &dev_attr_l1_daylight_max.attr,
647 &dev_attr_l1_daylight_dim.attr,
648 #ifdef ADP8860_EXT_FEATURES
649 &dev_attr_ambient_light_level.attr,
650 &dev_attr_ambient_light_zone.attr,
651 #endif
652 NULL
653 };
654
655 static const struct attribute_group adp8860_bl_attr_group = {
656 .attrs = adp8860_bl_attributes,
657 };
658
659 static int adp8860_probe(struct i2c_client *client,
660 const struct i2c_device_id *id)
661 {
662 struct backlight_device *bl;
663 struct adp8860_bl *data;
664 struct adp8860_backlight_platform_data *pdata =
665 dev_get_platdata(&client->dev);
666 struct backlight_properties props;
667 uint8_t reg_val;
668 int ret;
669
670 if (!i2c_check_functionality(client->adapter,
671 I2C_FUNC_SMBUS_BYTE_DATA)) {
672 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
673 return -EIO;
674 }
675
676 if (!pdata) {
677 dev_err(&client->dev, "no platform data?\n");
678 return -EINVAL;
679 }
680
681 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
682 if (data == NULL)
683 return -ENOMEM;
684
685 ret = adp8860_read(client, ADP8860_MFDVID, &reg_val);
686 if (ret < 0)
687 return ret;
688
689 switch (ADP8860_MANID(reg_val)) {
690 case ADP8863_MANUFID:
691 data->gdwn_dis = !!pdata->gdwn_dis;
692 /* fall through */
693 case ADP8860_MANUFID:
694 data->en_ambl_sens = !!pdata->en_ambl_sens;
695 break;
696 case ADP8861_MANUFID:
697 data->gdwn_dis = !!pdata->gdwn_dis;
698 break;
699 default:
700 dev_err(&client->dev, "failed to probe\n");
701 return -ENODEV;
702 }
703
704 /* It's confirmed that the DEVID field is actually a REVID */
705
706 data->revid = ADP8860_DEVID(reg_val);
707 data->client = client;
708 data->pdata = pdata;
709 data->id = id->driver_data;
710 data->current_brightness = 0;
711 i2c_set_clientdata(client, data);
712
713 memset(&props, 0, sizeof(props));
714 props.type = BACKLIGHT_RAW;
715 props.max_brightness = ADP8860_MAX_BRIGHTNESS;
716
717 mutex_init(&data->lock);
718
719 bl = devm_backlight_device_register(&client->dev,
720 dev_driver_string(&client->dev),
721 &client->dev, data, &adp8860_bl_ops, &props);
722 if (IS_ERR(bl)) {
723 dev_err(&client->dev, "failed to register backlight\n");
724 return PTR_ERR(bl);
725 }
726
727 bl->props.brightness = ADP8860_MAX_BRIGHTNESS;
728
729 data->bl = bl;
730
731 if (data->en_ambl_sens)
732 ret = sysfs_create_group(&bl->dev.kobj,
733 &adp8860_bl_attr_group);
734
735 if (ret) {
736 dev_err(&client->dev, "failed to register sysfs\n");
737 return ret;
738 }
739
740 ret = adp8860_bl_setup(bl);
741 if (ret) {
742 ret = -EIO;
743 goto out;
744 }
745
746 backlight_update_status(bl);
747
748 dev_info(&client->dev, "%s Rev.%d Backlight\n",
749 client->name, data->revid);
750
751 if (pdata->num_leds)
752 adp8860_led_probe(client);
753
754 return 0;
755
756 out:
757 if (data->en_ambl_sens)
758 sysfs_remove_group(&data->bl->dev.kobj,
759 &adp8860_bl_attr_group);
760
761 return ret;
762 }
763
764 static int adp8860_remove(struct i2c_client *client)
765 {
766 struct adp8860_bl *data = i2c_get_clientdata(client);
767
768 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
769
770 if (data->led)
771 adp8860_led_remove(client);
772
773 if (data->en_ambl_sens)
774 sysfs_remove_group(&data->bl->dev.kobj,
775 &adp8860_bl_attr_group);
776
777 return 0;
778 }
779
780 #ifdef CONFIG_PM_SLEEP
781 static int adp8860_i2c_suspend(struct device *dev)
782 {
783 struct i2c_client *client = to_i2c_client(dev);
784
785 adp8860_clr_bits(client, ADP8860_MDCR, NSTBY);
786
787 return 0;
788 }
789
790 static int adp8860_i2c_resume(struct device *dev)
791 {
792 struct i2c_client *client = to_i2c_client(dev);
793
794 adp8860_set_bits(client, ADP8860_MDCR, NSTBY | BLEN);
795
796 return 0;
797 }
798 #endif
799
800 static SIMPLE_DEV_PM_OPS(adp8860_i2c_pm_ops, adp8860_i2c_suspend,
801 adp8860_i2c_resume);
802
803 static const struct i2c_device_id adp8860_id[] = {
804 { "adp8860", adp8860 },
805 { "adp8861", adp8861 },
806 { "adp8863", adp8863 },
807 { }
808 };
809 MODULE_DEVICE_TABLE(i2c, adp8860_id);
810
811 static struct i2c_driver adp8860_driver = {
812 .driver = {
813 .name = KBUILD_MODNAME,
814 .pm = &adp8860_i2c_pm_ops,
815 },
816 .probe = adp8860_probe,
817 .remove = adp8860_remove,
818 .id_table = adp8860_id,
819 };
820
821 module_i2c_driver(adp8860_driver);
822
823 MODULE_LICENSE("GPL v2");
824 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
825 MODULE_DESCRIPTION("ADP8860 Backlight driver");
Linux with added FPC-III support